It depends :-)

If you know, it’s xml, you can read it by SAX or DOM or other methods (see QtXml [doc.qt.nokia.com] or QtXmlPatterns [doc.qt.nokia.com] ) and the work on the read data.

The other posibility is to read with QTextStream [doc.qt.nokia.com].

Examples to that can be found in the examples section of the documentation.

If it’s not xml to parse, I would read into a QString and search/insert there

First method (SAX, DOM) doesn’t work. Example programs gives error (unknown char)
How to read to a QString?

QString str;
str << file;
?

Gerof is right I think, I would use QTextStream too…

If you look at the given links (QTextStream [doc.qt.nokia.com] ) there is a description, how to read a file to a QString.

you can also read using QFile directly. From the docu:

or

or

For more information on that, I propose a look at the Qt documentation (link in the top right corner, called DOC) :-)

roosaw wrote:

First method (SAX, DOM) doesn’t work. Example programs gives error (unknown char) … ?

What type does your data has? is it XML? is it plain text?

Can you tell me how to convert whole file into QTextStream?
I’ve done something like this (after closing file):

From documentation i know that it convert out to QString. Now how can i seek a phrase in there?

Gerolf wrote:

roosaw wrote:

First method (SAX, DOM) doesn’t work. Example programs gives error (unknown char) … ?

What type does your data has? is it XML? is it plain text?

I downloaded page with:

Then use QString functions

look at the docu, it is really good

something with find/search/indexOf…

roosaw wrote:

Can you tell me how to convert whole file into QTextStream?
I’ve done something like this (after closing file):

1. QFile file("plik.xml");
2.  if (file.open(QFile::ReadWrite)) {
3.      QTextStream out(&plik);
4.      out.readAll();
5.      // out << "Result: " << qSetFieldWidth(10) << left << 3.14 << 2.7;
6.      // writes "Result: 3.14      2.7       "
7.  }
8. file.close();

From documentation i know that it convert out to QString. Now how can i seek a phrase in there?

or you can even in QString find. You have function indexOF [doc.qt.nokia.com] , who returns you position of looking word.

First read the file into a QString, change the QString and write the string back to the file.

BlackDante wrote:

You can first convert QFile into QString, example:
@QFile file(plik); QString item; file.open(QFile::ReadOnly); char buff²⁵⁵; while (!file.atEnd()) { file.readLine(buff, sizeof(buff)); item.append(buff); }@

Gerolf wrote:

1. QFile file("in.txt");
2.  if (!file.open(QIODevice::ReadOnly | QIODevice::Text))
3.      return;
4.  
5. QTextStream in(&file);
6. QString str = in.readAll();

Then use QString functions

look at the docu, it is really good

something with find/search/indexOf…

If you read all posts, you perhaps find the solution :-)

QString::indexOf [doc.qt.nokia.com]

If you want to read the complete file into a string readAll() is your friend:

If you read strings from a file it’s always better to use QTextStream, as it does the proper decoding (UTF-8 etc.) for you.